﻿// ConsoleTools
// Copyright (C) 2017-2024 Dust in the Wind
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

// --------------------------------------------------------------------------------
// Bugs or feature requests
// --------------------------------------------------------------------------------
// Note: For any bug or feature request please add a new issue on GitHub: https://github.com/lastunicorn/ConsoleTools/issues/new/choose

using System;

namespace DustInTheWind.ConsoleTools.Controls.Menus;

/// <summary>
/// Represents a command that executes an action.
/// </summary>
public class ActionCommand : ICommand
{
    /// <summary>
    /// Gets or sets the action to be executed by the command.
    /// </summary>
    public Action Action { get; set; }

    /// <summary>
    /// Gets or sets the function that decides if the command is active.
    /// </summary>
    public Func<bool> ActiveAction { get; set; }

    /// <summary>
    /// Gets a value that specifies if the current instance can be executed.
    /// </summary>
    public bool IsActive => ActiveAction?.Invoke() ?? true;

    /// <summary>
    /// Initializes a new instance of the <see cref="ActionCommand"/> class with
    /// null action.
    /// </summary>
    public ActionCommand()
    {
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ActionCommand"/> class with
    /// the action to be run when the command is executed.
    /// </summary>
    /// <param name="action">The action to be run when the command is executed.</param>
    public ActionCommand(Action action)
    {
        Action = action;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ActionCommand"/> class with
    /// the action to be run when the command is executed and
    /// the function that decides if the command is active.
    /// </summary>
    /// <param name="action">The action to be run when the command is executed.</param>
    /// <param name="activeAction">The function that decides if the command is active.</param>
    public ActionCommand(Action action, Func<bool> activeAction)
    {
        Action = action;
        ActiveAction = activeAction;
    }

    /// <summary>
    /// Executes the current instance.
    /// </summary>
    public void Execute()
    {
        if (IsActive)
            Action?.Invoke();
    }
}